[Entity] Handle undefined array type as string

[Tankilevitch]

Description

What - Currently the blueprint resource only supports array of type string, without specifying the actual type, which makes it return from the backend without items.type. This caused a bug with the entity state of string arrays where we didn't handle that kind of array type of "undefined".
Why -
How -

Type of change

Please leave one option from the following and delete the rest:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Non-breaking change (fix of existing functionality that will not change current behavior)
• Documentation (added/updated documentation)

[erikzaadi]